Key Stage 3
Meaning
Resistance is a description of how difficult it is to increase the current through a conductor when increasing the potential difference.
About Resistance
- The unit of resistance is the Ohm (Ω).
- Resistance cannot be directly measured. Resistance must be calculated by dividing the Potential Difference by the Current.
- Conductors have a low resistance and insulators have a high resistance.
Equation
\[Resistance = \tfrac{Potential Difference}{Current}\] \[R = \tfrac{V}{I}\] Where:
- R = Resistance
- V = Potential Difference
- I = Current